hump for a man or woman to sit on his/her back and move up and down, hard and fast

Girl: If I sit down here will you hump me?
Boy: Yeah!
The girl lays on the table on the guy gets on top of her and stabs his penis into the girl's vagina and her moves up and down on her hard and fast. "OOH! AAH!" She moans, "Faster! Faster!"